胜利褐煤油煤浆常压低温黏度变化研究

STUDY ON VISCOSITY OF SHENGLI COAL-SOLVENT SLURRY AT LOW-TEMPERATURE AND ATMOSPHERE

研究了常压低温条件下胜利褐煤油煤浆的黏度变化,重点分析了溶剂、温度、浓度以及煤粒度、溶胀和剪切速率、剪切时间对黏度的影响,并通过对实验数据的回归,建立了黏度变化的数学模型.实验结果表明,胜利褐煤油煤浆的黏度随溶剂黏度增加而增加,随煤粒度增加、剪切速率增大、剪切时间延长而降低;随煤油比增大呈指数递增型变化,方程为y=y0+A.exp(x/t),随温度增加呈指数递减型变化,方程为y=y0+A.exp(-x/t);常压低温条件下溶胀对胜利煤浆黏度变化影响较小.

Viscosity of coal-solvent slurry is an important technological parameter for designing coal direct liquefaction process. In this paper, some influencing factors for viscosity change of Shengli lignite coal-solvent slurry were studied at low-temperature and atmosphere, which includes solvent properties, granularity, the ratio of coal to solvent, temperature, solvent swelling, shearing rate and shearing time. And the viscosity altering equation was established by analysis and mathematic regression. The results show that viscosity of coal-solvent slurry increases with the increasing of solvent viscosity and decreasing of granularity, shearing rate and shearing time; the viscosity presents exponential increasing with the increasing of the ratio of coal to solvent, the equation as y=y0＋A · exp（x/t）, and exponential decreasing with the increasing of temperature, the equation as y = y0 ＋A · exp （- x/t）; solvent swelling gives less effect to viscosity of Shengli coal-solvent slurry.